An observer moves towards a stationary source of sound with a speed 1/5th of the speed of sound. The wavelength and frequency of the source emitted are λ and f respectively. The apparent frequency and wavelength recorded by the observer are respectively

(1) $1.2\text{\hspace{0.17em}}f,\text{\hspace{0.17em}}\lambda$

(2) $f,\text{\hspace{0.17em}}1.2\lambda$

(3) $0.8f,\text{\hspace{0.17em}}0.8\lambda$

(4) $1.2f,\text{\hspace{0.17em}}1.2\lambda$

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